Initial reports suggest the blast is thought to have come from a package sent by courier to an electronics company.

Maltepe is a commercial and residential district on the Asian side of the city.

Turkey has been on high alert in recent weeks after a spate of attacks by ISIL, Kurdish and far-leftist militants.

İstanbul Sultanbeyli'de 10 kişinin yaralandığı patlamanın sanayi sitesinde saç boyası imal eden bir atölyede meydana geldiği bildiriliyor. pic.twitter.com/gAuni3hbP4

— xyz (@rollbandage) 14 novembre 2016

İstanbul Sultanbeyli'de Oto Sanayi sitesinde meydana gelen patlamadan ilk detaylar ortaya çıktı. https://t.co/1t98iJNT1e pic.twitter.com/Su79oVF5rr

— Glickan (@tvhaberle) 14 novembre 2016